The water cooled motor and electric control system are equipped with built-in water pipes. The coolant flows through the motor and electric control unit to carry away heat and enter the water tank radiator for heat dissipation. Brushless electric fan and radiator are installed integrally to accelerate heat dissipation. The ECU fan controller monitors the coolant temperature in real time through temperature sensors distributed at the water tank inlet and outlet, and synchronously and intelligently adjusts the operating status of the cooling fan (start, low speed, stepless speed change, high speed, stop). Under the action of a brushless magnetic water pump, the cooled coolant flows into the drive motor and electronic control device to take away heat, which circulates to ensure that the drive motor operates in the optimal temperature range.